The invention relates to a production method of wet 
phosphoric acid byproducts comprising highly pure and highly white alpha-semi-hydrated 
gypsum and an inorganic-
organic compound fertilizer. The method comprises the following steps: carrying out an acidolysis reaction on 
phosphoric acid and 
phosphate rock 
powder, adding a filter aid to a mixed 
slurry obtained after the reaction, carrying out 
solid-liquid separation, washing the obtained 
solid phase to obtain washing water and a 
solid, crushing the solid, sending the crushed solid into a granulator, reacting the crushed solid with gasified 
ammonia in the granulator, adding fertilizers with different formulas, granulating, 
drying the granulated material, screening, cooling, and packaging to obtain the inorganic-
organic compound fertilizer; and introducing a 
clear liquid obtained after the acidolysis and solid-liquid separation into a decalcification and 
crystal transformation tank, adding a 
sulfuric acid solution and a 
crystal transformation agent, carrying out decalcification and 
crystal transformation reactions, carrying out solid-liquid separation to obtain a solid and a 
clear liquid, adding the solid into hot water, washing, and 
drying to obtain the highly pure and highly white alpha-semi-hydrated 
gypsum. The highly pure and highly white alpha-semi-hydrated 
gypsum with the advantages of excellent performances, white appearance and wide uses can be produced, and the inorganic-
organic compound fertilizer can be produced by using organic matters, 
phosphorus and resources residual in acid insoluble substances.